Kubernetes v1.16
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kube-apiserver

Synopsis

The Kubernetes API server validates and configures data
for the api objects which include pods, services, replicationcontrollers, and
others. The API Server services REST operations and provides the frontend to the
cluster’s shared state through which all other components interact.

kube-apiserver [flags]

Options

--add-dir-header

If true, adds the file directory to the header

--admission-control-config-file string

File with admission control configuration.

--advertise-address ip

The IP address on which to advertise the apiserver to members of the cluster. This address must be reachable by the rest of the cluster. If blank, the --bind-address will be used. If --bind-address is unspecified, the host's default interface will be used.

--allow-privileged

If true, allow privileged containers. [default=false]

--alsologtostderr

log to standard error as well as files

--anonymous-auth Default: true

Enables anonymous requests to the secure port of the API server. Requests that are not rejected by another authentication method are treated as anonymous requests. Anonymous requests have a username of system:anonymous, and a group name of system:unauthenticated.

--api-audiences stringSlice

Identifiers of the API. The service account token authenticator will validate that tokens used against the API are bound to at least one of these audiences. If the --service-account-issuer flag is configured and this flag is not, this field defaults to a single element list containing the issuer URL .

--apiserver-count int Default: 1

The number of apiservers running in the cluster, must be a positive number. (In use when --endpoint-reconciler-type=master-count is enabled.)

If set, all requests coming to the apiserver will be logged to this file. '-' means standard out.

--audit-log-truncate-enabled

Whether event and batch truncating is enabled.

--audit-log-truncate-max-batch-size int Default: 10485760

Maximum size of the batch sent to the underlying backend. Actual serialized size can be several hundreds of bytes greater. If a batch exceeds this limit, it is split into several batches of smaller size.

--audit-log-truncate-max-event-size int Default: 102400

Maximum size of the audit event sent to the underlying backend. If the size of an event is greater than this number, first request and response are removed, and if this doesn't reduce the size enough, event is discarded.

--audit-log-version string Default: "audit.k8s.io/v1"

API group and version used for serializing audit events written to log.

--audit-policy-file string

Path to the file that defines the audit policy configuration.

--audit-webhook-batch-buffer-size int Default: 10000

The size of the buffer to store events before batching and writing. Only used in batch mode.

--audit-webhook-batch-max-size int Default: 400

The maximum size of a batch. Only used in batch mode.

--audit-webhook-batch-max-wait duration Default: 30s

The amount of time to wait before force writing the batch that hadn't reached the max size. Only used in batch mode.

--audit-webhook-batch-throttle-burst int Default: 15

Maximum number of requests sent at the same moment if ThrottleQPS was not utilized before. Only used in batch mode.

--audit-webhook-batch-throttle-enable Default: true

Whether batching throttling is enabled. Only used in batch mode.

--audit-webhook-batch-throttle-qps float32 Default: 10

Maximum average number of batches per second. Only used in batch mode.

--audit-webhook-config-file string

Path to a kubeconfig formatted file that defines the audit webhook configuration.

Maximum size of the batch sent to the underlying backend. Actual serialized size can be several hundreds of bytes greater. If a batch exceeds this limit, it is split into several batches of smaller size.

--audit-webhook-truncate-max-event-size int Default: 102400

Maximum size of the audit event sent to the underlying backend. If the size of an event is greater than this number, first request and response are removed, and if this doesn't reduce the size enough, event is discarded.

--audit-webhook-version string Default: "audit.k8s.io/v1"

API group and version used for serializing audit events written to webhook.

--authentication-token-webhook-cache-ttl duration Default: 2m0s

The duration to cache responses from the webhook token authenticator.

--authentication-token-webhook-config-file string

File with webhook configuration for token authentication in kubeconfig format. The API server will query the remote service to determine authentication for bearer tokens.

The IP address on which to listen for the --secure-port port. The associated interface(s) must be reachable by the rest of the cluster, and by CLI/web clients. If blank, all interfaces will be used (0.0.0.0 for all IPv4 interfaces and :: for all IPv6 interfaces).

--cert-dir string Default: "/var/run/kubernetes"

The directory where the TLS certs are located. If --tls-cert-file and --tls-private-key-file are provided, this flag will be ignored.

--client-ca-file string

If set, any request presenting a client certificate signed by one of the authorities in the client-ca-file is authenticated with an identity corresponding to the CommonName of the client certificate.

--cloud-config string

The path to the cloud provider configuration file. Empty string for no configuration file.

--cloud-provider string

The provider for cloud services. Empty string for no provider.

--contention-profiling

Enable lock contention profiling, if profiling is enabled

--cors-allowed-origins stringSlice

List of allowed origins for CORS, comma separated. An allowed origin can be a regular expression to support subdomain matching. If this list is empty CORS will not be enabled.

--default-not-ready-toleration-seconds int Default: 300

Indicates the tolerationSeconds of the toleration for notReady:NoExecute that is added by default to every pod that does not already have such a toleration.

--default-unreachable-toleration-seconds int Default: 300

Indicates the tolerationSeconds of the toleration for unreachable:NoExecute that is added by default to every pod that does not already have such a toleration.

--default-watch-cache-size int Default: 100

Default watch cache size. If zero, watch cache will be disabled for resources that do not have a default watch size set.

--delete-collection-workers int Default: 1

Number of workers spawned for DeleteCollection call. These are used to speed up namespace cleanup.

List of the preferred NodeAddressTypes to use for kubelet connections.

--kubelet-timeout duration Default: 5s

Timeout for kubelet operations.

--kubernetes-service-node-port int

If non-zero, the Kubernetes master service (which apiserver creates/maintains) will be of type NodePort, using this as the value of the port. If zero, the Kubernetes master service will be of type ClusterIP.

--livez-grace-period duration

This option represents the maximum amount of time it should take for apiserver to complete its startup sequence and become live. From apiserver's start time to when this amount of time has elapsed, /livez will assume that unfinished post-start hooks will complete successfully and therefore return true.

--log-backtrace-at traceLocation Default: :0

when logging hits line file:N, emit a stack trace

--log-dir string

If non-empty, write log files in this directory

--log-file string

If non-empty, use this log file

--log-file-max-size uint Default: 1800

Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited.

--log-flush-frequency duration Default: 5s

Maximum number of seconds between log flushes

--logtostderr Default: true

log to standard error instead of files

--master-service-namespace string Default: "default"

DEPRECATED: the namespace from which the kubernetes master services should be injected into pods.

--max-connection-bytes-per-sec int

If non-zero, throttle each user connection to this number of bytes/sec. Currently only applies to long-running requests.

--max-mutating-requests-inflight int Default: 200

The maximum number of mutating requests in flight at a given time. When the server exceeds this, it rejects requests. Zero for no limit.

--max-requests-inflight int Default: 400

The maximum number of non-mutating requests in flight at a given time. When the server exceeds this, it rejects requests. Zero for no limit.

--min-request-timeout int Default: 1800

An optional field indicating the minimum number of seconds a handler must keep a request open before timing it out. Currently only honored by the watch request handler, which picks a randomized value above this number as the connection timeout, to spread out load.

--oidc-ca-file string

If set, the OpenID server's certificate will be verified by one of the authorities in the oidc-ca-file, otherwise the host's root CA set will be used.

--oidc-client-id string

The client ID for the OpenID Connect client, must be set if oidc-issuer-url is set.

--oidc-groups-claim string

If provided, the name of a custom OpenID Connect claim for specifying user groups. The claim value is expected to be a string or array of strings. This flag is experimental, please see the authentication documentation for further details.

--oidc-groups-prefix string

If provided, all groups will be prefixed with this value to prevent conflicts with other authentication strategies.

--oidc-issuer-url string

The URL of the OpenID issuer, only HTTPS scheme will be accepted. If set, it will be used to verify the OIDC JSON Web Token (JWT).

--oidc-required-claim mapStringString

A key=value pair that describes a required claim in the ID Token. If set, the claim is verified to be present in the ID Token with a matching value. Repeat this flag to specify multiple claims.

--oidc-signing-algs stringSlice Default: [RS256]

Comma-separated list of allowed JOSE asymmetric signing algorithms. JWTs with a 'alg' header value not in this list will be rejected. Values are defined by RFC 7518 https://tools.ietf.org/html/rfc7518#section-3.1.

--oidc-username-claim string Default: "sub"

The OpenID claim to use as the user name. Note that claims other than the default ('sub') is not guaranteed to be unique and immutable. This flag is experimental, please see the authentication documentation for further details.

--oidc-username-prefix string

If provided, all usernames will be prefixed with this value. If not provided, username claims other than 'email' are prefixed by the issuer URL to avoid clashes. To skip any prefixing, provide the value '-'.

--profiling Default: true

Enable profiling via web interface host:port/debug/pprof/

--proxy-client-cert-file string

Client certificate used to prove the identity of the aggregator or kube-apiserver when it must call out during a request. This includes proxying requests to a user api-server and calling out to webhook admission plugins. It is expected that this cert includes a signature from the CA in the --requestheader-client-ca-file flag. That CA is published in the 'extension-apiserver-authentication' configmap in the kube-system namespace. Components receiving calls from kube-aggregator should use that CA to perform their half of the mutual TLS verification.

--proxy-client-key-file string

Private key for the client certificate used to prove the identity of the aggregator or kube-apiserver when it must call out during a request. This includes proxying requests to a user api-server and calling out to webhook admission plugins.

--request-timeout duration Default: 1m0s

An optional field indicating the duration a handler must keep a request open before timing it out. This is the default request timeout for requests but may be overridden by flags such as --min-request-timeout for specific types of requests.

--requestheader-allowed-names stringSlice

List of client certificate common names to allow to provide usernames in headers specified by --requestheader-username-headers. If empty, any client certificate validated by the authorities in --requestheader-client-ca-file is allowed.

--requestheader-client-ca-file string

Root certificate bundle to use to verify client certificates on incoming requests before trusting usernames in headers specified by --requestheader-username-headers. WARNING: generally do not depend on authorization being already done for incoming requests.

--requestheader-extra-headers-prefix stringSlice

List of request header prefixes to inspect. X-Remote-Extra- is suggested.

--requestheader-group-headers stringSlice

List of request headers to inspect for groups. X-Remote-Group is suggested.

--requestheader-username-headers stringSlice

List of request headers to inspect for usernames. X-Remote-User is common.

--runtime-config mapStringString

A set of key=value pairs that describe runtime configuration that may be passed to apiserver. <group>/<version> (or <version> for the core group) key can be used to turn on/off specific api versions. api/all is special key to control all api versions, be careful setting it false, unless you know what you do. api/legacy is deprecated, we will remove it in the future, so stop using it.

--secure-port int Default: 6443

The port on which to serve HTTPS with authentication and authorization.It cannot be switched off with 0.

--service-account-issuer string

Identifier of the service account token issuer. The issuer will assert this identifier in "iss" claim of issued tokens. This value is a string or URI.

--service-account-key-file stringArray

File containing PEM-encoded x509 RSA or ECDSA private or public keys, used to verify ServiceAccount tokens. The specified file can contain multiple keys, and the flag can be specified multiple times with different files. If unspecified, --tls-private-key-file is used. Must be specified when --service-account-signing-key is provided

--service-account-lookup Default: true

If true, validate ServiceAccount tokens exist in etcd as part of authentication.

--service-account-max-token-expiration duration

The maximum validity duration of a token created by the service account token issuer. If an otherwise valid TokenRequest with a validity duration larger than this value is requested, a token will be issued with a validity duration of this value.

--service-account-signing-key-file string

Path to the file that contains the current private key of the service account token issuer. The issuer will sign issued ID tokens with this private key. (Requires the 'TokenRequest' feature gate.)

--service-cluster-ip-range string Default: "10.0.0.0/24"

A CIDR notation IP range from which to assign service cluster IPs. This must not overlap with any IP ranges assigned to nodes for pods.

--service-node-port-range portRange Default: 30000-32767

A port range to reserve for services with NodePort visibility. Example: '30000-32767'. Inclusive at both ends of the range.

--shutdown-delay-duration duration

Time to delay the termination. During that time the server keeps serving requests normally and /healthz returns success, but /ready immediately returns failure. Graceful termination starts after this delay has elapsed. This can be used to allow load balancer to stop sending traffic to this server.

The media type to use to store objects in storage. Some resources or storage backends may only support a specific media type and will ignore this setting.

--target-ram-mb int

Memory limit for apiserver in MB (used to configure sizes of caches, etc.)

--tls-cert-file string

File containing the default x509 Certificate for HTTPS. (CA cert, if any, concatenated after server cert). If HTTPS serving is enabled, and --tls-cert-file and --tls-private-key-file are not provided, a self-signed certificate and key are generated for the public address and saved to the directory specified by --cert-dir.

--tls-cipher-suites stringSlice

Comma-separated list of cipher suites for the server. If omitted, the default Go cipher suites will be use. Possible values: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_RC4_128_SHA,TLS_RSA_WITH_3DES_EDE_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_RC4_128_SHA

A pair of x509 certificate and private key file paths, optionally suffixed with a list of domain patterns which are fully qualified domain names, possibly with prefixed wildcard segments. If no domain patterns are provided, the names of the certificate are extracted. Non-wildcard matches trump over wildcard matches, explicit domain patterns trump over extracted names. For multiple key/certificate pairs, use the --tls-sni-cert-key multiple times. Examples: "example.crt,example.key" or "foo.crt,foo.key:*.foo.com,foo.com".

--token-auth-file string

If set, the file that will be used to secure the secure port of the API server via token authentication.

-v, --v Level

number for the log level verbosity

--version version[=true]

Print version information and quit

--vmodule moduleSpec

comma-separated list of pattern=N settings for file-filtered logging

--watch-cache Default: true

Enable watch caching in the apiserver

--watch-cache-sizes stringSlice

Watch cache size settings for some resources (pods, nodes, etc.), comma separated. The individual setting format: resource[.group]#size, where resource is lowercase plural (no version), group is omitted for resources of apiVersion v1 (the legacy core API) and included for others, and size is a number. It takes effect when watch-cache is enabled. Some resources (replicationcontrollers, endpoints, nodes, pods, services, apiservices.apiregistration.k8s.io) have system defaults set by heuristics, others default to default-watch-cache-size